Our planet's automatic transformation of dead dinosaurs and dead cavepeople and other organic matter into petroleum is thermal depolymerization
I don't believe anyone has ever demonstrated the chemical reactions required to turn dinosaurs into the crude we find in the Earth.
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the conagra plant in Missouri is producing an oil similar to No. 4 grade crude oil, ... at prices more than 10 percent less than ... a conventional refinery.
http://www.nynewsday.com/business/printedition/ny-liturk073836915jun07,0,1005048.story?coll=ny-business-print
I'm not denying the existence of thermal depolymerization.
I'm asking if any plausible reactions have been proposed that match the contents of naturally occuring crude.